rear brakes locking up.. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**jamie72** · 01-14-2005, 03:56 PM

i bought an 85 4x4 to drive in the winter, seems the rear brakes lock up with only about 1-2 inches of pedal pressure?? where do i start to try to correct this?? prop valve ? master cylinder??
thanks jamie

chev74 · 01-14-2005, 04:23 PM

at the bottom on the inside there is a slot where you can adjust your rear drums as the shoes wear down... they could be too tight. take off the rear wheel and see how hard it is to get the drum off. they could have been overtightened in an adjustment.

bigblock73 · 01-14-2005, 04:44 PM

You might also have a leaky axle seal causing gear lube to get on the shoes and "grab" the drums. Happened to me once.

eagle23 · 01-14-2005, 04:50 PM

I had the same thing happen, too, but from a leaking wheel cylinder.

No indication from the outside of the backing plate, until I took off the drum. It made the good-running side wear so much that IT was down to the rivets

and THAT was the one that kept locking up.

Brian

**jamie72** · 01-14-2005, 07:08 PM

thanks guys,gives me a starting point.

01-14-2005, 03:56 PM	#1
jamie72 Senior Member Join Date: Apr 2000 Location: madison indiana Posts: 3,839	rear brakes locking up.. i bought an 85 4x4 to drive in the winter, seems the rear brakes lock up with only about 1-2 inches of pedal pressure?? where do i start to try to correct this?? prop valve ? master cylinder?? thanks jamie __________________ jamie72 72 BB cheyenne -- Restoration getting started.. member #807 http://www.myspace.com/whitetailobsession www.antlertalk.com

01-14-2005, 04:44 PM	#3
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,826	You might also have a leaky axle seal causing gear lube to get on the shoes and "grab" the drums. Happened to me once. __________________ Jeff 73-87.com 73-87.com Facebook page 73-87 cab corner 6x9 speaker brackets for sale 67-72 cab corner speaker brackets for sale 47-54 cab corner speaker brackets for sale

01-14-2005, 07:08 PM	#5
jamie72 Senior Member Join Date: Apr 2000 Location: madison indiana Posts: 3,839	thanks guys,gives me a starting point. __________________ jamie72 72 BB cheyenne -- Restoration getting started.. member #807 http://www.myspace.com/whitetailobsession www.antlertalk.com

01-14-2005, 04:23 PM	#2
chev74 Addicted to Chevy Join Date: Dec 2004 Location: Tyler, Tx Posts: 857	at the bottom on the inside there is a slot where you can adjust your rear drums as the shoes wear down... they could be too tight. take off the rear wheel and see how hard it is to get the drum off. they could have been overtightened in an adjustment.

01-14-2005, 04:50 PM	#4
eagle23 Active Member Join Date: Feb 2004 Location: Atlanta GA Posts: 174	I had the same thing happen, too, but from a leaking wheel cylinder. No indication from the outside of the backing plate, until I took off the drum. It made the good-running side wear so much that IT was down to the rivets and THAT was the one that kept locking up. Brian



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